They have seen Chicago, Detroit, Baltimore, and all of the cities with Draconian gun laws and they believe they can think of more gun laws in Maryland that will stop the shootings.
Pipe dreaming.

As long as guns or weapons exist there will be some crazy bastid that is willing to use that weapon to kill people.
Outlaws and killers do not obey laws.
The only people punished by new laws are those who do not intend to break the laws we have.